25697239 has 2 divisors, whose sum is σ = 25697240. Its totient is φ = 25697238.

The previous prime is 25697167. The next prime is 25697257. The reversal of 25697239 is 93279652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25697239 - 2¹⁹ = 25172951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25697195 and 25697204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25697299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12848619 + 12848620.

It is an arithmetic number, because the mean of its divisors is an integer number (12848620).

Almost surely, 2^25697239 is an apocalyptic number.

25697239 is a deficient number, since it is larger than the sum of its proper divisors (1).

25697239 is an equidigital number, since it uses as much as digits as its factorization.

25697239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 25697239 is about 5069.2444210158. The cubic root of 25697239 is about 295.0952062713.

The spelling of 25697239 in words is "twenty-five million, six hundred ninety-seven thousand, two hundred thirty-nine".